mingw32 needs the pthread_win32 files

Makefile.am

@@ -35,4 +35,6 @@ include_HEADERS = 				\
 	include/starpu_perfmodel.h		\
 	include/starpu_util.h			\
 	include/starpu_opencl.h			\
-	include/starpu_expert.h
+	include/starpu_expert.h			\
+	include/pthread_win32/pthread.h		\
+	include/pthread_win32/semaphore.h